You can also find your phone number by going to your iPhone’s Contacts. To do this, simply tap on the phone icon, go to the Contacts tab and click on My Card.
From here you can also copy your phone number by tapping and holding the number and tapping Copy, or share your number by selecting Share Contact at the bottom of the card.
If you still don’t see your number, you can also find it by connecting your iPhone to your Mac or PC and going to iTunes.
Your phone number should be in the Summary section when you click on the phone icon.